Spark-plug.



I. H. SARB.

SPARK Pugs. APPLICATION FILED JUNE 16, 1914- 1,1'50,392, Patented Aug. 17, 1915.

2 ij 19 23 j 23 2,%- -72,

IRA H. SARE. OF SENTINEL, OEQAEIGMA.

SPARK-PLUG.

Application filed June 16, 1914.

To all Whom it 1)? (1y concern Be it known that 1. 1m H. Sana, citizen of the United States. residing at Sentinel, in the county of Washita and State of Oklahoma. have invented certain new and useful Improvements in Spark-Plugs, of which the following is a specification.

' This invention relates, to spark plugs and the primary object of the invention is to provide a plug of simple construction which may be readilyappliel l to an engine and will be equipped with means whereby the spark will be spread and enlarged so as to produce a hot flame.

A further object of the invention is to provide a plug of simple construction which will permit the spark to be tested and adjusted at any time.

The stated objects and such other inci-' dental objects as will appear as thedescri r tion of the invention proceeds are attained in the use oi such a device as is illustrated in the accompanying drawings, and the invention resides in certain novel features which will be particularly pointed out in the claims following the description.

In the annexed drawings, Figure l is a central longitudinal section of a spark plug, embodying my present improvements; Fig. 2 is a horizontal section taken on the line 2-2 of Fig. 1.

In carrying out my invention I employ a base consisting of a sleeve 1 externally threaded as shown at whereby it may be easily secur d in the wall of an engine cylinder and flared above the said threaded portion, as shown at 3. to provide a spark chamber. Above the tla'red portion 3 the base is provided with straight walls at andait the upper extremity oi the said straight walls :l is an externally threaded portion 5 to facilitatcthe attachment of a cap (3. The porce lain plug body 7' is provided with an annular rib 3, thereby presenting a lower shoulder 9 which is adapted to rest upon' the upper end of the base, and an upper shoulder 10 against which the clamping action of the cap may be exerted. A spring gasket 11 is inserted between the top of the cap 6 and the shoulder 10 of the plug body 7 so as to effect a firm fastening between the cap and the base and at the same time accommodate any expansion which may take place in the plug body. Around the lower shoulder 9 of the porcelain body I secure a copper ferrule Specification of Letters Patent.

Patented Aug. 1'? 1915.

Serial no. 845.47%.

or contact plate 12 which will be pressed into intimate engagement with the base and also with the cap (3. when arranged as shown in the present drawings, so that the terminal 13 which is embedded in the body 7 will have a direct grounded connection with the battery or the magneto. It will be noted that the terminal 13 extends through the body 7 and has its extremity projecting below the lower end thcreot' within the spark chamber, and this terminal. as well as the terminal l-l. will be placed withi l the body when the same is manufactured. The extremities of the terminals l3 and 1% are spaced apart. as clearly shown in Fig. l, and between the same I interpose a radiator or spreader 15 consisting of a ring or similar device having a shank or extension 16 which is embedded in the lower end of the porcelain body 7. This radiator or spreader will, or course. be insulated from and out of contact ith both terminals.

The. upper end of the terminal ll projects slightly above the upper end of the porcelain body T. as shown at l7. and around the upper end of the body T is fitted a metallic ring or annular wear-plate 18 which is externally threaded as shown. a sleeve 19 being-1 threaded upon the said wearplate. The upper end of the sleeve 19 s closed by'a head 20 having a central threaded aperture in which is mounted a screw 21 having its lower end 22 normally arranged a short distance from but directlv in axial alinement with the upper end 17 of the terminal ll. A transparent ring or sleeve 23 is fitted within the sleeve 1 and the said sleeve 19 is provided with openings ill so that a spark passing between the end 22 of the screwQl and the end 17 of the terminal 1% may be, seen at all times. A look nut 25 is mounted upon the screw 21 so that when the nut is turned home against the head 20 the screw will be locked in its adjusted position and a milled nut 26 is mounted upon the screw above the said lock nut so as to secure the end. of a conducting wire firmly in place. If a conductor having a spring-socket terminal is employed, the said socket may he engaged over the spherical head 27 of the screw, and the said head is provided with a notch or slot 28 to permit the engagement of v the screw by a screw-driver when adjusting thesame.

It is thought the use and advantages of my spark plug will be evident from the foregoing description taken in connection with the accompanying drawings.

The spark for supplying the charge in the engine is produced between the terminals l3 and 14: and. as it will impinge directly upon the spreader 15, it will be diverted laterally so that a large intense flame will be produced and the charge positively v ignited. The condition of the battery or the magneto may be readily determined by viewing the upper spark gap through the openings 2%, and the members 17 and 22 which produce the gap are all inelosed and protected against injury while at the same time they are always visible.

The device is exceedingly simple in .the construction and arrangement of its parts and may be manufactured andapplied to an engine at a very low cost. 7

rlla\'ing thus described my invention, what I claim as new is:

1. A spark plug comprising a metallic base having a spark chamber in its upper portion, a body of insulation having an annular rib resting upon the upper end of said base and having its lower end disposed within the spark chamber of the base, a contact plate on the underside of said. rib bearing upon and forming an electrical connec'tion with the base, a terminal leading from said contact plate through the body and project-" ing from the lower end of the same within the spark chamber, a second terminal extending through'the body and projecting from the lower end thereof within the spark chamber and spaced from the first-mentioned terminal, and a cap fitting over said rib and engaging the base to clamp the rib I IRA H. SARE. v

I Witnesses;

J. W. LAMBRIGHT, E. J \VININGHAM, 

